package location

import (
	"context"
	"golang.org/x/text/language"
	"net/http"

	"github.com/jackc/pgx/v4"

	"dev.tandem.ws/tandem/camper/pkg/auth"
	"dev.tandem.ws/tandem/camper/pkg/database"
	"dev.tandem.ws/tandem/camper/pkg/form"
	httplib "dev.tandem.ws/tandem/camper/pkg/http"
	"dev.tandem.ws/tandem/camper/pkg/locale"
	"dev.tandem.ws/tandem/camper/pkg/template"
)

type AdminHandler struct {
}

func NewAdminHandler() *AdminHandler {
	return &AdminHandler{}
}

func (h *AdminHandler) Handler(user *auth.User, company *auth.Company, conn *database.Conn) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		var head string
		head, r.URL.Path = httplib.ShiftPath(r.URL.Path)

		switch head {
		case "":
			switch r.Method {
			case http.MethodGet:
				f := newLocationForm(company.Locales)
				if err := f.FillFromDatabase(r.Context(), company, conn); err != nil {
					if !database.ErrorIsNotFound(err) {
						panic(err)
					}
				}
				f.MustRender(w, r, user, company)
			case http.MethodPut:
				updateLocationSettings(w, r, user, company, conn)
			default:
				httplib.MethodNotAllowed(w, r, http.MethodGet)
			}
		default:
			http.NotFound(w, r)
		}
	})
}

func updateLocationSettings(w http.ResponseWriter, r *http.Request, user *auth.User, company *auth.Company, conn *database.Conn) {
	f := newLocationForm(company.Locales)
	if ok, err := form.Handle(f, w, r, user); err != nil {
		return
	} else if !ok {
		f.MustRender(w, r, user, company)
		return
	}
	tx := conn.MustBegin(r.Context())
	defer tx.Rollback(r.Context())
	var defaultLang = company.DefaultLanguage.String()
	if err := tx.SetupLocation(r.Context(), company.ID, f.Directions[defaultLang].Val, f.MapEmbed.Val, f.OpeningDates[defaultLang].Val); err != nil {
		panic(err)
	}
	for lang := range company.Locales {
		if lang == company.DefaultLanguage {
			continue
		}
		if err := tx.TranslateLocation(r.Context(), company.ID, lang, f.Directions[lang.String()].Val, f.OpeningDates[lang.String()].Val); err != nil {
			panic(err)
		}
	}
	tx.MustCommit(r.Context())
	httplib.Redirect(w, r, "/admin/location", http.StatusSeeOther)
}

type locationForm struct {
	Directions   form.I18nInput
	MapEmbed     *form.Input
	OpeningDates form.I18nInput
}

func newLocationForm(locales locale.Locales) *locationForm {
	return &locationForm{
		Directions: form.NewI18nInput(locales, "directions"),
		MapEmbed: &form.Input{
			Name: "map_embed",
		},
		OpeningDates: form.NewI18nInput(locales, "opening_dates"),
	}
}

func (f *locationForm) FillFromDatabase(ctx context.Context, company *auth.Company, conn *database.Conn) error {
	var directions database.RecordArray
	var openingDates database.RecordArray
	err := conn.QueryRow(ctx, `
		select location.directions::text
             , location.map_embed::text
             , location.opening_dates::text
		     , array_agg((lang_tag, i18n.directions::text))
		     , array_agg((lang_tag, i18n.opening_dates::text))
        from location
        left join location_i18n as i18n using (company_id)
    	where company_id = $1
		group by location.directions::text
		       , location.map_embed::text
		       , location.opening_dates::text
`, pgx.QueryResultFormats{pgx.BinaryFormatCode}, company.ID).Scan(
		&f.Directions[company.DefaultLanguage.String()].Val,
		&f.MapEmbed.Val,
		&f.OpeningDates[company.DefaultLanguage.String()].Val,
		&directions,
		&openingDates,
	)
	if err != nil {
		return err
	}
	if err := fillI18nInput(f.Directions, directions); err != nil {
		return err
	}
	if err := fillI18nInput(f.OpeningDates, openingDates); err != nil {
		return err
	}
	return nil
}

func fillI18nInput(input form.I18nInput, array database.RecordArray) error {
	for _, el := range array.Elements {
		tag, err := language.Parse(el.Fields[0].Get().(string))
		if err != nil {
			return err
		}
		input[tag.String()].Val = el.Fields[1].Get().(string)
	}
	return nil
}

func (f *locationForm) MustRender(w http.ResponseWriter, r *http.Request, user *auth.User, company *auth.Company) {
	template.MustRenderAdmin(w, r, user, company, "location.gohtml", f)
}

func (f *locationForm) Parse(r *http.Request) error {
	if err := r.ParseForm(); err != nil {
		return err
	}
	f.Directions.FillValue(r)
	f.MapEmbed.FillValue(r)
	f.OpeningDates.FillValue(r)
	return nil
}

func (f *locationForm) Valid(l *locale.Locale) bool {
	v := form.NewValidator(l)
	return v.AllOK
}